Grinding or polishing machine.



No; 696,945. Patented Apr. a, |992. A. cnocKEn.

GRIN-DING 0B POLI-SHINE MACHINE. (Appuegtion med un. 1o, 1901.) (lin Iludel.) 3 Sheets-Smet I.

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No. 696,945. Patented Apr. 8, |1902. A. CRUCKER.

GBINDING 0R POLISHIVNG MACHINE. (Appliwion and nu. 1o, 1901.) (No Model.) 3 Sheets-sheet 2.

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ADAMS ClOCKER, OF FITCHBURG, MASSACHUSETTS.

GRlNDING OR POLISHING MACHINE.

SPECFlCATON forming part of Letters Patent No. 696,945, dated April 8, 1902. Application filed January 10, 1901. Serial No. 42,739. (No model.)

T LZZ wil/077e t may concern:

Be it known that I, ADAMS CROCKER, a citizeu of the United States, and a resident of Fitchburg, county of Worcester, State of Massachusetts, have invented an Im provement in Grinding or Polishing Machines; of which the following description, in connection with the l Wish it understood, however, that the inapparatus.

vention is not limited to such use.

The apparatus comprises generally a frame which supports a reciprocating platen or Workholder, the driving mechanism for said Workholder or platen being provided with a reversing mechanism, which is operated by the platen as it reaches the end of its stroke, combined with a jointed swing-arm suspended from a suitable shaft, said swing-arm carrying at its free end a rotating, abrading, or polishing Wheel and having at its joint pulleys for transmitting the motion from the shaft to the Wheel, said pulleys being located on the outside of the arm, whereby the belts may be easily removed or replaced Without dismantling the swing-arm. The said swingarm also carries a suitable bunter, which cooperates with stop-bars upon the frame to limit the horizontal movement of the said arm.

It will be understood, of course, that the platen or Work-holder reciprocates in a direction at right angles to the movement of the swing-arm.

Figure 1 is a front elevation of myimproved Fig. 2 is a side elevation thereof. Fig. 3 is a partial plan view showing the stopbars upon the frame. Fig. 4 is a section through the joint of the swing-arm. Fig. 5 is a transverse section of the bearing for the shaft of the grinding or polishing Wheel. Fig. 6 is a detail, on an enlarged scale, of the manner of mounting the shaft which carries the abrading or polishing Wheel. Fig. 7 is a detail hereinafter described.

The frame A for the machine may be of any suitable construct-ion, it having the guide- Ways 3, upon which is mounted for reciprocating movement the platen or work-holder 4, to which the Work is secured in any suitable way. The said work-holder or platen has rigidly attached thereto the rack 5, which engages and is driven by the gear-wheel 6. mounted upon the transverse shaft 7, which is suitably journaled in the frame, the said shaft carrying at its inner end a Worm-Wheel S, which in turn meshes with the worm 9 upon the driving-shaft 10, said shaft being mounted in any suitable Way in the frame A. The end of the shaft 10 carries the ordinary beltreversing mechanism,comprisi ng the drivingpulleys 1112, loose on the shaft, and the pulley 13, fast thereon, and the oppositely-driven belts 14 and 15, one of which drives the fast pulley 13 and the other of which runs over one of the loose pulleys, the said belts being driven from the pulley 17 upon any usual counter-shaft 1S.

In order to reverse the direction of rotation of the shaft 10, and consequently of the platen 4, the belts 14 and 15 are moved to the left in Fig. 1, thereby -causing the belt 14 to drive the fast pulley 18, the belt 15 meanwhile running upon the loose pulley 11, and such shifting of the belt to reverse the rotation of the shaft 10 is accomplished by the platen 4 by the followingmeans: Thebelt-shipper, which comprises the rod 20, having arms engaging the belts 14 15 in the usual Way, is supported for sliding movement in a suitable guide 2l on the frame (see Fig. 2) and is connected at its end to the arm 22, mounted upon the rock-shaft 23, supported in the frame A, the said rock-shaft having at its opposite eind the arm 24, to which the slide-rod 25 is pivotally attached, said slide-rod playing at one end in a suitable guide 25. A depending arm 26, rigid With the platen 4, engages the rod 25, and said rod has thereon adjustable stops 27, Which cooperate with the arm 26 to shift the slide-rod 25, and thereby reverse the direction of rotation of the shaft 10.

By adjusting the stops 27 it Will be obvious that the length of reciprocation of the platen 4 may be varied as desired.

Preferably coiled springs 2S, surrounding the shaft 25, Will be placed between the arm IOO same is mounted upon a jointed swing-arm C,

which is suspended from a suitable countershaft 30, the said swing-arm carrying the abrading-wheel at its free end and having suitable handles 53 attached thereto, whereby the workman may guide the same over the surface tobe polished. As illustrated, said swing-arm is a jointed arm and comprises the vertical member' 31, pivotally hung from the shaft 30, and the balanced horizontal member `32, pivoted at one end to the vertical member 31 and carrying at its other end the abrading or polishing wheel In order to drive the polishing-wheel, a su itable shaft having pulleys thereon is provided atthe joint between the two members 31 32, the said shaft being driven by a belt from the counter-shaft 30 and in turn driving the ab rading-wheel by a second belt,the construction of the swing-arm being such that any movement of the swing-arm does not affect the tightness or looseness of the driving-belts.

The vertical member 31 comprises the upper yoke 35, which is hung upon the shaft 30, and

the lower yoke 36, the said yokes being adj ust-- ably connected together by the rod 37, which is shown as screw-threaded into each of the yokes. The yoke 36 has a bearing in its lower end, in which is rotatably mounted in any suitable way the shaft 37X, and the inner end of the horizontal member 32 of the arm has the head 39, sleeved upon the shaft 37 and coniined between the arms of the yoke 36.. The outer end of the member 32 has the yoke 40, which is adj ustably connected to the head 39 by the screw-threaded rod 41, the arms of the said yoke 40 having at their ends a suitable bearing, hereinafter described, in which is rotatably mounted the shaft 42, carrying the abrading or polishing wheel 33. The shaft Y37X has fast thereon and outside the arms of the yokes suitable pulleys 44 45, the said pulley 44 being in line with and being driven by a pulley 46 on the counter-shaft 30 outside of the yoke 35, the pulley 45 being in line with and driving by a suitable belt a pulley 47, fast upon the shaft 42, the. pulley 47 being located between the arms of the yoke 40, as seenin Fig. 1.

The object in placing the belt-pulleys 44', 45, and 46 on the ends of the shafts and outside of the arms of the yokes is to enable the belts playing on said pulleys to be readily removed or replaced without taking apart the whole mechanism of the swing-arm, as is remeans being so proportioned and disposed as Y to exactly couuterbalance the weight of said horizontal member and the abrading or polishing wheel, so that when the said wheel is.

raised from the surface of the work to any desired position it will remain there.

Inasmuch as the weight of the horizont-al member and abrading-wheel is sustained by the counterbalance, the operator when grinding or polishing can give any degree of pressure to the wheel desired and can therefore regulate the grinding or polishing action to a nicety.

One simple form of counterbalance is illustrated in Fig. 2, (the illustration of this feature being omitted from Fig. 1 to avoid confusion,) wherein the yoke 40 of the horizontal member 32 is shownas having an eyebolt secured therein, to which is attached a flexible connection 71, such as a chain or rope, which passes over pulley 72, situated approximately vertically over the eyebolt 70 and se-v cured to any suitable support, the said flexible connection passing over a suitable direction-pulley 73 and having suitable Weights 74 attached to its end, the direction-pulley 73.

being so situated as to place the weights 74 in some convenient position. Other forms of counterbalance may be used, if desired, however.

The shaft 42 rotates in suitable sleeves 50, of Babbitt metal or similar material, said sleeves preferably havin g their outer surfaces polygonal in shape, and the ends of the arms `of the yokes 40, as well as the cap-plates 51,

are formed with corresponding-shaped recesses, whereby the bushing 50, in which the shaft 42 rotates, is firmly Vheld in place.A

The cap-plate 51 is not the full width of the bearing,so that there is left the circular flange 52, integral with the arms of the yoke 40, the said circular flange 52 having a threaded aperture therein in line with the shaft 42, in which are screwed handles 53, which are preferably of some suitable composition, such as bronze-metal, and which when screwed in place engage the end of the shaft 42, as clearly` seen in Fig. 6, suitable check-nuts 54 being employed, if desired, to lock the said handles against rotation. By means of this construction the handles 53 not only serve as means by which the operator may guide the abrading-wheel 33 back and forth across the Work, but also by adjusting the saidhandles the shaft 42 may be tightened against longitudinal movement in its bearings.

Preferably the horizontal member 32 of the swing-arm C will be provided with a suitable bunter 60, which is shown as an arm fast on IOO IIO

i Il e said member and carrying at its lower end the wooden faces 6l. Cooperating with the bunter 60 are suitable stop-bars G2, also preferably of wood, which are carried in suitable socket-pieces 63, adjust-ablymounted upon the frame A, as seen in Figs. 2 and 3, the frame A having for this purpose the slot 6%,

1 through which the clamping-bolts 65 pass and by means of which the stop-bars 62 may be adjusted to any position, thus limiting the horizontal movement of the swing-arm according to the width of the work operated upon and preventing the polishing or abrading wheel from running over the edges of the work, and thus rounding the same.

It sometimes is advantageous for the operator to give the abrading-wheel a circular motion, and this is provided for by the rod 37, which is screw-threaded into the upper and lower yokes 35 36 ofthe vertical member 3l.

It. will be obvious to thoseskilled in the art that various modifications may be made in the details of my apparatus without departing from the spirit of my invention.

Having fully described my invention, what I claim as new, and desire to sec n re by Lett ers Patent, is-

l. In a grinding-machine, a reciprocating platen or work-holder, means to reciprocate the same, a swing-arm carrying apolishing- Wheel, said swing-arm comprising a vertical member suspended from a driving-shaft and having a shaft journaled in its lower end, a horizontal member pivotally mounted at one end on said last-named shaft and carrying at its other end the polishing or abrading wheel, and pulleys on the end of the shaft connecting the horizontal and vertical members and on the outside of said members for transmitting motion from the driving-shaft to the polishing-wheel. A

2. In a grinding-machine, a frame, a reciprocating platen or work-holder thereon, combined with a swing-arm for supporting the polishing-wheel, said arm comprising a vertical member suspended from a drive-shaft and having a yoke at its lower end, a shaft mounted therein, a horizontal member pivotally mounted at one end on said shaft and between-the arms of the yoke, and having a shaft journaled in its other end on which is mounted a polishing or abrading wheel, the shaft connecting the horizontal and vertical members having at each end outside the arms ofi` the yoke a pulley, and belts connecting one of said pulleys with the abrading-wheel, and the other pulley with the counter-shaft.

3.` In a grinding-machine, a reciprocating platen or work-holder, means to reciprocate the same, combined with a jointed swing-arm suspended from a driving-shaft and carrying at its free end ya shaft on which is mounted an abrading-wheel, pulleys located at the joint of said arm and outside of the same, belts cooperating therewith for transmitting motion from the driving-shaft to the abradin gwheel, the construction being such that the belts may be removed or replaced without disconnecting the swing-arm combinedwith counterbalancing means for said swing-arm.

il. In a grinding-machine, a reciprocating platen or work-holder, means toreciproc'ate the same, combined with `a swing-arm supported from a driving-shaft and carrying at its free end an abrading-wheel, said swingarm comprising a vertical-memberand a hori` zontal member, one of said members having a yoke-at one end and the other member having a head tted between the arms of the yoke, a shaft passing through said head andthe arms of the yoke and serving to pivotallyconuect said members, a pulley on each end of said shaft outside of the arms of the yoke, and belts connecting said pulleys with the counter-shaft and abrading-wheel, respectively, the said vertical member of the swingarm having a swivel connection between `its ends, whereby the abrading-wheel may be given a circular motion.

5. In a grinding-machine, a frame, a reciprocatingplatcn or work-holder thereonnneans to reciprocate the same, combined with a swing-arm supported from a driving-shaft and carrying at its` free end an abradingwheel, said swing-arm comprising a vertical member, a horizontal member, and a shaft connecting said members ou each end cf which is mounted a pulley outsideof said members, belts connecting said pulleys with the counter-shaft and abrading-wheel, a bunter on the horizontal member, and stopbars on the frame cooperating therewith to limit the horizontal movement of the swingarm. i l l o'. In a grinding-machine, a frame having guideways, a platen or work-holder supported thereon for reciprocating movement,and having connected therewith a rack, a gear en-` gaging said rack, a shaft connected with said gear, and reversing mechanismfor said shaft,

means operated by the platen as it reaches the end of its stroke to operate said reversing mechanism combined withajointed swingarm supported from a driving-shaft and carrying at one end an abrading-wheel, pulleys located at the joint of said swing-arm and on the outside of said arm, and belts transmitting motion from the driving-shaft'to the abrading-wheel.

7. In a grinding-machine, a frame having g uideways, a platen or work-holder supportedU thereon for reciprocating movement, and having connected therewith a rack, a gear engaging said rack, a shaft connected `with said gear for rotating the same, and reversing mechanism for theshaft comprising a sliding rod having adjustable cushioned stops thereou, and an arm on the platen slidingly engaging said rod whereby the reversing mechanism is operated by the platen, combined with a jointed swing-arm suspended from a driving-shaft, and carrying at its `free end an abrading-wheel, transmitting-pulleys located IOO IIS

' thereon mounted in said yoke with the wheel at the joint thereof, and on the outside of said arm, and belts connecting said pulleys with the abrading-wheel and driving-shaft respectively.

8. In a grinding-machine, a frame having guideways, a platen or work-holder supported thereon for reciprocating movement, and having connected therewith a rack, a gear engaging said rack, a shaft connected with said gear, reversing mechanism for said shaft, means operated by the platen as it reaches the end of its stroke to operate said reversing mechanism, combined with a jointed swing-arm supported from a drive-shaft and carrying atits free end an abrading-wheel, transmitting-pulleys located at the joint of said arm and on the outside thereof, belts connecting said pulleys with the driving-shaft and abrading-wheel respectively, a bunter on said swing-arm, and adjustable stop-bars on the frame coperating therewith, to limit the longitudinal movement of said arm.

9. In a grinding-machine, a reciprocating platen or work-holder, a jointed swing-arm suspended from a shaft and carrying at its free end a yoke, a shaft journaled therein having an abrading-wheel thereon, means for driving saidshaft from the driving-shaft, and adjusting devices in the said yoke and engaging the ends of the abrading-wheel shaft, whereby the said shaft may be held against longitudinal movement in its bearings.

l0. In a grinding-machine, a reciprocating platen or work-holder, a jointed swing-arm suspended from a shaft, and carrying at one end a yoke, a shaft having an abrading-wheel between the arms of the yoke, handles adjustably secured in the said yoke and in line with the abrading-wheel shaft, and bearing against the ends of said shaft, whereby the shaft may he adjusted for longitudinal wear, and means for transmitting motion from the drive-shaft to the abrading-wheel shaft.

l1. In an apparatus of the class described, a reciprocating platen or work-holder, means to reciprocate the same, a swinging arm suspended over the work-holder and comprising a vertical member mounted to swing about a horizontal axis, a horizontal member pivoted to the lower end of said vertical member, said horizontal member being mounted to swing about both a horizontal and a Vertical axis, a polishing or abrading wheel supported on the free end of said horizontal member, means to rotate said Wheel and stops coperating with the horizontal arm to limit its movement in one direction.

l2. In a grinding-machine, a reciprocating platen or work-holder, means to reciprocate the same, a swinging arm suspended over the work-holder and com prising a vertical member and a horizontal member pivoted together, a polishing or abradin g wheel carried by Said horizontal member,means to rotate said wheel and stops to limit the movement vof the swinging arm in a direction transverse to the movement of the platen.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ADAMS CROOKER.

Vitnesses:

' GEo. W. GREGORY, LOUISE RorHsrEIN. 

